Inspection time and cognitive abilities in twins aged 7 to 17 years: age-related changes, heritability and genetic covariance

Edmonds, Caroline J. and Isaacs, Elizabeth B. and Visscher, Peter M. and Rogers, Mary and Lanigan, Julie and Singhal, Atul and Lucas, Alan and Gringras, Paul and Denton, Jane and Deary, Ian J. (2008) ‘Inspection time and cognitive abilities in twins aged 7 to 17 years: age-related changes, heritability and genetic covariance’, Intelligence, 36(3), pp. 210-225. (doi:10.1016/j.intell.2007.05.004).

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Official URL: http://dx.doi.org/10.1016/j.intell.2007.05.004

Abstract

We studied the age-related differences in inspection time and multiple cognitive domains in a group of monozygotic (MZ) and dizygotic (DZ) twins aged 7 to 17 years. Data from 111 twin pairs and 19 singleton siblings were included. We found clear age-related trends towards more efficient visual information processing in older participants. There were substantial correlations between inspection time and cognitive abilities. The heritability of inspection time was 45%, and ranged from 73% to 85% for cognitive abilities. There were significant non-shared environmental effects on inspection time and Wechsler IQ scores, but no shared environmental effects. The genetic correlation between inspection time and Performance IQ was 0.55 and with Verbal IQ it was 0.28. There was a significant non-shared environmental correlation of 0.24 between inspection time and Verbal IQ.

Item Type: Article
Additional Information: Citation: Edmonds, C.J. et al (2008) ‘Inspection Time and cognitive abilities in twins aged 7 to 17 years: development, heritability and genetic covariance’. Intelligence, 36 (3) 210-225.
Divisions: Schools > Psychology, School of > Institute for Research in Child Development
Depositing User: Mr Stephen Grace
Date Deposited: 17 Dec 2009 11:44
Last Modified: 19 Aug 2013 13:18
URI: http://hdl.handle.net/10552/451

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